U.S. Navy investigators have found that the officers on a nuclear submarine failed to take into account a variety of danger signs before the vessel smashed into an undersea mountain in January, Navy officials said in interviews last week.

The officials said crew members on the submarine, the San Francisco, did not look at some navigational charts of the South Pacific that might have suggested more caution. The sailors also should have checked the water depth more frequently and should not have been traveling at high speed, the officials said.

One sailor was killed and 98 were injured on Jan. 8 when the submarine crashed into the mountain 360 miles southeast of Guam. The Navy has said the mountain was not marked on the charts, but investigators found that several charts showed other possible hazards and had inconsistencies that should have prompted greater caution.

The findings are part of a report that is likely to be released within several weeks.

The submarine’s captain, Cmdr. Kevin Mooney, has been replaced, and Navy officials said other officers could be disciplined. The accident crushed the vessel’s bow, and repairs could cost $90 million to $100 million.

Lt. Cmdr. Jeff A. Davis, a spokesman for the Pacific Fleet, would not comment on the investigation. But he said the Navy had briefed the rest of its submarine captains on maintaining “a skeptical attitude” about the charts.

Davis said the Navy began the briefings last month to pass along lessons from the crash. He said the captains were also told to watch for other cues, like sonar soundings that do not match what the charts suggest the ocean depth should be at a certain spot.

Pentagon officials have said that the San Francisco ran aground three miles from the nearest hazard on its main chart. It was traveling at 30 knots, more than 500 feet below the surface, when it hit the mountain.

Navy officials had previously said that crew members took a sounding just four minutes before the crash, and that it had indicated the vessel was still in 6,000 feet of water.

But the investigators have found that the last sounding was taken 12 minutes before the crash.

And the report is likely to suggest that crew members should have taken more frequent soundings in that area.

Satellite images taken in recent years show the mountain rising within 100 feet of the surface. But the main chart was not updated to note the hazard until after the crash.

Mooney, the former captain, has said the charts indicated that the submarine was on a clear track.

A shipyard in Guam is preparing the San Francisco to return, on the surface, to the continental United States, where more extensive repairs will be performed.

The vessel, which carried 137 sailors, was commissioned in 1981. Its nuclear reactor, which was not damaged by the crash, was refueled in 2002 during a $200 million overhaul.

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